Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2014	$ 289	$ 90,218	$ 99,003	$ 365	$ 189,875
Balance (in Shares) at Dec. 31, 2014	28,962
Stock-based compensation		3,134			3,134
Stock-based compensation (in Shares)	14
Stock issued on vesting of RSUs	$ 3				3
Stock issued on vesting of RSUs (in Shares)	411
Taxes paid on vesting of RSUs		(1,029)			(1,029)
Taxes paid on vesting of RSUs (in Shares)	(136)
Dividends			(4,794)		(4,794)
Net income			20,132		20,132	[1]
Other		(48)		(453)	(501)
Balance at Dec. 31, 2015	$ 292	92,275	114,341	(88)	206,820
Balance (in Shares) at Dec. 31, 2015	29,251
Stock-based compensation		2,539			2,539
Stock issued on vesting of RSUs	$ 2				2
Stock issued on vesting of RSUs (in Shares)	272
Taxes paid on vesting of RSUs		(1,098)			(1,098)
Taxes paid on vesting of RSUs (in Shares)	(126)
Dividends			(4,799)		(4,799)
Net income			12,510		12,510	[1]
Other		100		816	916
Other (in Shares)	16
Balance at Dec. 31, 2016	$ 294	93,816	122,052	728	216,890
Balance (in Shares) at Dec. 31, 2016	29,413
Stock-based compensation		7,261			7,261
Stock issued on vesting of RSUs	$ 5				5
Stock issued on vesting of RSUs (in Shares)	991
Taxes paid on vesting of RSUs		(3,204)			(3,204)
Taxes paid on vesting of RSUs (in Shares)	(449)
Dividends			(4,892)		(4,892)
Net income			33,076		33,076	[1]
Other				187	187
Balance at Dec. 31, 2017	$ 299	$ 97,873	$ 150,236	$ 915	$ 249,323
Balance (in Shares) at Dec. 31, 2017	29,955

[1] There is no material difference between net income and comprehensive income.